[Al_Capone_Junior]

Because you described him as a loose cannon, I would call without much doubt. If he actually has a hand, well then you'll just have to get beat. But I think you'll be ahead more often than not here. If he had been playing in a more reasonable fashion I might feel differently.

One thing you didn't mention was how many players were left. If it's bubble time, or there are several very short stacks, then laying down might be a better play.

al